Characterization of pentavalent and hexavalent americium complexes in nitric acid using X-ray absorption fine structure spectroscopy and first-principles modeling. - Riddle, Catherine; Czerwinski, Kenneth; Kim, Eunja; Paviet, Patricia; Weck, Philippe; Poineau, Frederic; Conradson, Steven (Journal of Radioanalytical & Nuclear Chemistry, 2016)